Optical module and scan-type image projection display device

Abstract

To provide an optical module and a scan-type image projection display device at low power consumption in a configuration of enhancing a heat radiation property with excellent assembly performance. An optical module for coupling and irradiating laser beams from a plurality of laser diodes, and onto a desired position is characterized in that a first protruded part corresponding to a first laser holder for holding a first laser diode 1 a and a second protruded part corresponding to a second laser holder for holding a second laser diode are provided on a base for placing the optical module thereon, and heat conductive materials are provided between the first protruded part and the first laser holder and between the second protruded part and the second laser holder, respectively.

1 . An optical module for coupling and irradiating laser beams from a plurality of laser diodes onto a desired position, the optical module having a base for placing the optical module thereon, and a cover for covering the optical module, wherein the base is provided with a protruded part, and a heat conductive material is provided between the protruded part and a laser holder for holding a laser diode. 
     
     
         2 . The optical module according to  claim 1 ,
 wherein the base for placing the optical module thereon is provided with a first protruded part corresponding to a first laser holder for holding a first laser diode, and a second protruded part corresponding to a second laser holder for holding a second laser diode, and   a heat conductive material is provided between the first protruded part and the first laser holder and between the second protruded part and the second laser holder.   
     
     
         3 . The optical module according to  claim 2 ,
 wherein the first laser diode is a red laser diode and the second laser diode is a green laser.   
     
     
         4 . The optical module according to  claim 2 ,
 wherein a distance between a protruded part in an optical axis direction of a laser diode and the laser holder, in which a heat conductive material is applied, is shorter than a distance between a protruded part in a direction other than the optical axis of the laser diode and the laser holder, in which a heat conductive material is applied.   
     
     
         5 . The optical module according to  claim 2 ,
 wherein a plane of a protruded part having a similar shape to a laser holder is provided on at least two planes other than a plane in an opposite direction to the laser holder in which the optical module is attached on the base and a plane of a module casing in which the laser holder is attached, and   a heat conductive material is provided between the protruded part and the laser holder.   
     
     
         6 . The optical module according to  claim 4 ,
 wherein the laser holder is extended in a direction in which the optical module is attached on the base viewed from the laser holder, and   a heat conductive material is provided between the extended laser holder and a protruded part.   
     
     
         7 . The optical module according to  claim 4 , wherein a cover is provided with the protruded part. 
     
     
         8 . A scan-type image projection display device comprising:
 an optical module for coupling laser beams from a plurality of laser diodes, and irradiating the laser beams coupled by a scanning mirror onto a desired position;   a video signal processing circuit for extracting a horizontal synchronization signal and a vertical synchronization signal from an externally-input image signal;   a laser diode drive circuit for supplying a drive current to each of the laser diodes; and   a scanning mirror drive circuit for controlling the scanning mirror on the basis of the horizontal synchronization signal and the vertical synchronization signal,   wherein a base for placing the optical module thereon is provided with a first protruded part corresponding to a first laser holder for holding a first laser diode and a second protruded part corresponding to a second laser holder for holding a second laser diode, and   a heat conductive material is provided between the first protruded part and the first laser holder and between the second protruded part and the second laser holder.